Evolution is the process by which modern organisms have descended from ancient
ancestors. Evolution is responsible for both the remarkable similarities we
see across all life and the amazing diversity of that life  but exactly how
does it work?

Fundamental to the process is genetic variation upon which selective forces
can act in order for evolution to occur. This section examines the mechanisms
of evolution focusing on:

Descent and the genetic differences that are
heritable and passed on to the next generation;